 /*******************************************************************************
  * Copyright (c) 2001, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.views.properties.tabbed.view;

 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CLabel;
 import org.eclipse.swt.events.PaintEvent;
 import org.eclipse.swt.events.PaintListener;
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Font;
 import org.eclipse.swt.graphics.FontData;
 import org.eclipse.swt.graphics.GC;
 import org.eclipse.swt.graphics.Image;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.layout.FormAttachment;
 import org.eclipse.swt.layout.FormData;
 import org.eclipse.swt.layout.FormLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.ui.forms.IFormColors;
 import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetWidgetFactory;


 /**
  * The title in the tabbed property sheet page.
  *
  * @author Anthony Hunter
  */
 public class TabbedPropertyTitle
     extends Composite {

     private CLabel label;

     private Image image = null;

     private String text = null;
     
     private static final String BLANK = ""; //$NON-NLS-1$

     private static final String TITLE_FONT = "org.eclipse.ui.internal.views.properties.tabbed.view.TabbedPropertyTitle"; //$NON-NLS-1$

     private TabbedPropertySheetWidgetFactory factory;

     /**
      * Constructor for TabbedPropertyTitle.
      *
      * @param parent
      * the parent composite.
      * @param factory
      * the widget factory for the tabbed property sheet
      */
     public TabbedPropertyTitle(Composite parent,
             TabbedPropertySheetWidgetFactory factory) {
         super(parent, SWT.NO_FOCUS);
         this.factory = factory;

         this.addPaintListener(new PaintListener() {

             public void paintControl(PaintEvent e) {
                 if (image == null && (text == null || text.equals(BLANK))) {
                     label.setVisible(false);
                 } else {
                     label.setVisible(true);
                     drawTitleBackground(e);
                 }
             }
         });

         factory.getColors().initializeSectionToolBarColors();
         setBackground(factory.getColors().getBackground());
         setForeground(factory.getColors().getForeground());

         FormLayout layout = new FormLayout();
         layout.marginWidth = 1;
         layout.marginHeight = 2;
         setLayout(layout);

         Font font;
         if (! JFaceResources.getFontRegistry().hasValueFor(TITLE_FONT)) {
             FontData[] fontData = JFaceResources.getHeaderFont().getFontData();
             fontData[0].setHeight(10);
             JFaceResources.getFontRegistry().put(TITLE_FONT, fontData);
         }
         font = JFaceResources.getFont(TITLE_FONT);
         
         label = factory.createCLabel(this, BLANK);
         label.setBackground(new Color[] {
                 factory.getColors().getColor(IFormColors.H_GRADIENT_END),
                 factory.getColors().getColor(IFormColors.H_GRADIENT_START) },
                 new int[] { 100 }, true);
         label.setFont(font);
         label.setForeground(factory.getColors().getColor(IFormColors.TITLE));
         FormData data = new FormData();
         data.left = new FormAttachment(0, 0);
         data.top = new FormAttachment(0, 0);
         data.right = new FormAttachment(100, 0);
         data.bottom = new FormAttachment(100, 0);
         label.setLayoutData(data);

         /*
          * setImage(PlatformUI.getWorkbench().getSharedImages().getImage(
          * ISharedImages.IMG_OBJ_ELEMENT));
          */
     }

     /**
      * @param e
      */
     protected void drawTitleBackground(PaintEvent e) {
         Rectangle bounds = getClientArea();
         label.setBackground(new Color[] {
                 factory.getColors().getColor(IFormColors.H_GRADIENT_END),
                 factory.getColors().getColor(IFormColors.H_GRADIENT_START) },
                 new int[] { 100 }, true);
         Color bg = factory.getColors().getColor(IFormColors.H_GRADIENT_END);
         Color gbg = factory.getColors().getColor(IFormColors.H_GRADIENT_START);
         GC gc = e.gc;
         gc.setForeground(bg);
         gc.setBackground(gbg);
         gc.fillGradientRectangle(bounds.x, bounds.y, bounds.width,
                 bounds.height, true);
         // background bottom separator
 gc.setForeground(factory.getColors().getColor(
                 IFormColors.H_BOTTOM_KEYLINE1));
         gc.drawLine(bounds.x, bounds.height - 2, bounds.x + bounds.width - 1,
                 bounds.height - 2);
         gc.setForeground(factory.getColors().getColor(
                 IFormColors.H_BOTTOM_KEYLINE2));
         gc.drawLine(bounds.x, bounds.height - 1, bounds.x + bounds.width - 1,
                 bounds.height - 1);
     }

     /**
      * Set the text label.
      *
      * @param text
      * the text label.
      * @param image
      * the image for the label.
      */
     public void setTitle(String text, Image image) {
         this.text = text;
         this.image = image;
         if (text != null) {
             label.setText(text);
         } else {
             label.setText(BLANK);
         }
         label.setImage(image);
         redraw();
     }
 }

